what I need to do, is get the loaded amount, get the width of the timeLine, and figure how wide the preloader should be. So...
100% loaded needs to equal the width of the timeLine
50% loaded needs to equal the half the width of the timeLine
and so on...

this works the same as YouTube's video loader, and all the others.

timeLine width:

controlsBG.timeLine.vidLen._width // timeLine width

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Basic concept of a percentage is x/100. x% means x/100 (in simple terms). So, when you're taking Math.round(my_ns.bytesLoaded/my_ns.bytesTotal * 100); to make it a percent, you need to divide it by 100 again to get a usable number for multiplication.

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It doesn't work, it says that if it is 100% loaded, then it is only is 50% of the bar wide.

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